The main span of the Mackinac Bridge (see Fig. 4.84) in northern Michigan is 1160 m long. The angle subtended by the span at the eye of an observer in a helicopter is 2.2°. Show that the distance calculated from the helicopter to the span is about the same if the line of sight is perpendicular to the end or to the middle of the span.

Transcribed Image Text:

-1160 m→ 2.2° Fig. 4.84 200